Document
BL5980
Low Voltage Photoelectric Smoke Detector ASIC with Interconnect and Timer Mode
1.0. INTRODUCTION
1.1 Features
Low Quiescent Current Consumption Two AA Battery Operation Internal Power On Reset Local Alarm Memory Internal Low Battery detector Interconnect up to 40 Detectors 9 minute Timer for Sensitivity Control Temporal or Continuous Horn Pattern Low Battery and Chamber Test Internal Infrared Emitter Diode (IRED) driver Adjustable IRED Drive current Adjustable Hush Sensitivity Available in SOP16
1.2 Pin Diagrams
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BL5980
1.3 Description
The BL5980 is a low power, low voltage photoelectric type smoke detector IC. With minimal external components, this circuit will provide all the required features for a photoelectric-type smoke detector. A check for a low battery condition is performed every 86 seconds, and chamber integrity is tested once every 43 seconds, when in Standby. The temporal horn pattern supports the NFPA 72 emergency evacuation signal. The BL5980 incorporates a gain-selectable photo amplifier for use with an infrared emitter/detector pair. An internal oscillator strobes power to the smoke detection circuitry every 10 seconds, to keep the standby current to a minimum. If smoke is sensed, the detection rate is increased to verify an Alarm condition. A high gain mode is available for push button chamber testing. An internal 9 minute timer can be used for a Reduced Sensitivity mode. An interconnect pin allows multiple detectors to be connected such that, when one unit alarms, all units will sound. the BL5980 was designed for use in smoke detectors that comply with Underwriters Laboratory Specification UL217 and UL268.
1.4 Ordering Information
Order Number BL5980
Package Type SOP-16
Marking
BL5980 XXXXX
Packing
Reel Tape Tube
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1.5 Typical Application Circuit
BL5980
VSS VSS
VSS
3V AA Battery
C1 vss 10uF
L1 10uH
D1
C4 4.7uF
LX(16)
VBST(15)
R1 C2 100 1uF
VDD(3) Power for low
voltage module
Comparator
RS PWM LATCH CLK
Current Sense
High frequence
OSC
Boost Comparator
BIAS
Precision Reference
VDD
Low Battery Comparator
VSS(1)
Power on Trimmed reset Oscilator
IRCAP(11)
C3 100uF
D2
IRP(6)
Programmable IRED Current
IRED DRIVER
IRED(2)
R7
Photo
100
D3 IRN(7) Integrator
GLED(9)
D5
from precision reference
Programmable
DAC
Smoke Comparator
Control Logic and Timming
VBST
R6 330
Limits
D4
RLED(8)
VSS VSS
R5 330
To other Units
C6 33uF
Push-to-TEST/HUSH VDD
IO(12)
Interconnect
To programme every module
TEST(4) Test Mode
TEST2(5) Identify
44bit
44bit
Allocation …… MTP
and Calibration
Cell Lifetime
REG
Data
LTD Data
MTP W/R ctrl
VBST
Horn Driver Level shift
HB(13)
HS(14)
FEED(10)
Horn
C5 R3 1nF R4 200K
1.5M
Note
1: C2 should be located as close as possible to the device power pins, and C1 should be located as close as possible to VSS.
2: R3, R4 and C5 are typical values and may be adjusted to maximize sound pressure.
3: Schottky diode D1 must have a maximum peak current rating of at least 1.5A. For best results it should have forward voltage specification of less than 0.5V at 1A, and low reverse leakage.
4: Inductor L1 must have a maximum peak current rating of at least 1.5A.
5: DC-DC converter in High Boost mode (nominal VBST = 9.6V) can draw current pulses of greater than 1A, and is therefore very sensitive to series resistance. Critical components of this resistance are the inductor DC resistance, the internal resistance of the battery and the resistance in the connections from the inductor to the battery, from the inductor to the LX pin and from the VSS pin to the battery. In order to function properly under full load at VDD= 2V, the total of the inductor and interconnect resistances should not exceed 0.3Ω. The internal battery resistance should be no more than 0.5Ω, and a low ESR capacitor of 10 µF or more should be connected in parallel with the battery, to average the current draw over the boost converter cycle.
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BL5980
2.0. ELECTRICAL CHARACTERISTICS
2.1 Absolute Maximum Ratings
Supply Voltage ....................................................VDD=5.5V; VBST =13V Input Voltage Range Except FEED, TEST......... VIN = -0.3V to VDD +0.3V FEED Input Voltage Range................................ VINFD =-10 to +22V TEST Input Voltage Range ............................... VINTEST =-.3V to VBST+.3V Input Current except FEED.................................. IIN = 10 mA Continuous Operating Current (HS, HB, VBST).. IO= 40 mA Continuous Operating Current (IRED) ................IOIR= 300 mA Operating Temperature ......................................TA = -10 to +60°C Storage Temperature .........................................TSTG = -55 to +125°C
Notice: Stresses above those listed under “Maximum ratings” may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions a.